Slag launder-lining.



W. A. LEDDELL.

SLAG LAUNDER LINING.

ICATION FILED FEB 15 1 AP 915- 1,189,842. v I PatentedJuly 4,1916.

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' WILLIAM A. LEDDELL, or MORENCI, ARIZONA.

SLAG .LAUNDER-LINING.

To all whom it may concern:

Be it known that I, l/VILLIAM A. LEDDELL, a citizen of the United States, and a resident of Morenci, in the county of Greenlee and State of Arizona, have invented certain new and useful Improvements in Slag Launder-Lining, of which the following is a specification.

The invention relates to liners for launders and the like, as used, for example, in concentrator work as well as for dry flow material, crushed ore, etc., when the latter are crushed sufficiently fine.

It has for its object to provide an inexpensive substitute for the metallic and other liners now employed for this purpose and which latter rapidly deteriorate and wear. The liner hereinafter described remains intact, is not subject to the action of acid water and its wearing surface is considerably harder than that of the liners generally employed. proved liner, furthermore, provides a use for a waste product heretofore of little value.

The nature of the invention will be best understood when described in connection with the accompanying drawings, in which- Figure 1 shows a liner in perspective. Fig. 2 is a transverse section thereof, and Fig. 3 is a fragmentary section through the liner. Rig. 4 illustrates another form of the liner.

Similar characters of reference designate corresponding parts throughout the several views.

I have found that if a slag, for example, copper blast furnace slag and which consists principally of about 40% of S10 and a similar amount of FeO, be treated as hereinafter set forth that an article results which is suitable for lining launders as aforesaid. The same, furthermore, may be transported and handled Without undue care-no packing being necessary. I am aware that glass liners havebeen proposed as a substitute for the rapidly destroyed metal liners, but the .cost of the same 1s prohibitive for launders of any length, a glass liner one-half inch thick costing much more per foot laid down than a two-inch improved liner.

In carrying out the invention, the molten slag is cast in suitable iron molds to the desired shape, which may be as shown in Specification of Letters Patent. v

uniform thickness throughout.

and 11 extend at right angles to the base 12 The composition of the im.

Patented July 4, 1916.

Application filed February 15, 1915. Serial No. 8,219.

1 of the drawings and preferably of Sides 10 and each side and the bottom is reinforced throughout its length by two layers of a properly located hexagon wire screen 13 of one-inch or less mesh. In Fig. 4, the liner is shown in the form of a flat plate 14 and 1s likewise reinforced by two layers of reinforcing wire screens 15.

The wire reinforcement which is of about #20 gage wire will prevent undue shrinkage and also cracking on cooling to an injurious extent and will maintain the liner intact. Any slight cracks formed, as well as the joints between successive liners, will be filled by the sand in the solution flowing through the launder. The casting chills rapidly on the outer surface, hardening before the interior; and in that state I have found it is very tough so that it may be easily handled without cracking. It is removed from the mold in this condition and is then covered with some non-conducting material as sand, or, preferably powdered lime, if the latter be available at a reasonable cost. This effects an annealing of the liner and which is continued for a suitable period usually not less than 20 hours. The liner is then ready to be placed in position for use; and though brittle, will remain intact and will give service for much longer time than the liners heretofore employed. It is suitable, moreover, not only for liquids, but, also, for dry flow material, etc., provided of course the same does not produce too heavy a shock. Material passing through a one-inch mesh or under could be used with the aforesaid liner and the same will, therefore, be serviceable for chute bottom, etc. Because of the comparative in-- reasonable shock and of withstanding Wear.

2. An acid-resisting liner for launders and the like composed of annealed copper blast furnace slag containing substantially 40% of SiO and 40% of FeO and reinforcing material embedded therein, said liner possessing the property of remaining substantially intact under reasonable shock and of withstanding Wear.

3. An acid-resisting, channel-shaped liner composedof annealed copper slag and reinforcing Wire-screen embedded throughout.

the sides and bottom thereof, said linerpossessing the property of remaining substan-t copies o'f thh patent inay be obtained for five eents each, by addressing, the Gommimonerof Intent.

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